External hardware: A button on the tap input, a switch on the mode input, LEDs on the 8 outputs, and audio output on the first output. Don’t just connect headphones or speakers directly! It could fry the circuit, you need some sort of amplifier.
How it works
The second button press sets a ceiling value for the 1kHz counter. When the counter hits that value, it barrel-shifts the outputs by one bit. When the mode pin isn’t asserted, the first output pin emits digital noise generated by a LFSR
How to test
Set 1kHz clock on first input. After reset, set mode to 1, tap the tap button twice within one second. The outputs should set to the beat